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RALPH l. BAILEY, OF NIAGARA FALLS, NEW YORK. Letters Patent No. 65,999, dated June 25, i867.

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TOALL WIIOM I'l MAY CONCERN:A

Be it known that I, RALPH P. BAILE'VLof Niagara Falls, in the county of Niagnra,and State of New York, have invented a new and improved Machine for Working, Dressing, and Ornamenting Marble, Stone, Slate, and other similar substances; and I do hereby declare that the following is a full and exact description thereof, reference h eing had to the accompanying drawings, in which- Figure il is an elevation of my improvement.

Figure 2 is an enlarged sectional view of l-portion ot` the disk A, and one of the arms C and Scrapers h detached. Y

Figure 3 is an enlarged side view of one ot' the arms C wit-h a portion of the disks head in transverse section.

Like .letters designate corresponding parts in all ofthe ligures. Y

y invention is designed especially for the working of mouldings on slabs of marble, slate, Sie., .as required for mantel-shelves and tops of furniture, and consists of a series of flexible arms or Scrapers provided with suitable blades of steel, or other suitable tool for the purpose, attached to a rotary or otherwise movable head or stock, whereby said blades are successively brought in contact with the stone, removing the superfluous parts by the gradual abrasion or scraping away thereof. As represented in thc drawing- A. is a diskl's'haped head or stock designed to'be attached to any suitable rotating shaft b. To it are pivoted any required number ofthe arms C', by means of the pivots d, on which they vibrate to the extent permitted by lthe stock-bolts a e, as shown mosticlcarly by thc red lines in Iig. 2. These bolts serve the double purpose of bearings against which lthe arms rest and of securing the annular rim F to the head A, which rim holds the arms firmly against lateral displacement. Each arm is provided with a plate, f, secured to it by four bolts gg, forming a clamp for holding thc blade or scraperi.,which consists of a plate of steel, preferably of uniform thickness and ofiany requiredlcngth. This bl'ade is held by unset-screw, 7:, passing centrally, ornearly'so, through the holding'portion of thc arm C, and pressing'that portion ofthe blade against the clamping-blade f. The surfaces of the plate and arm contiguous to the blade yare bevelled away, as at z'z', to allowit to spring under the pressure with which it is applied, as shown in red lines at j, tig. Q. Keys l Z are inserted in t-heholder at each side lof the blade of suitable thickness to regulate the bearings. The blades are shaped at their ends to conform to the moulding or other ornament to be produced on the marble; heingof steel suliiciently hard to remove, by scraping, a portion of the surface,V when arranged in a head as shown, and revolving in contact with the edge or other portion of a slab of marble, one follows 'the other in' quick succession, each removing'a small portion,`but in the aggregate executing with a rapidity exceeding by iivefold thatof manual labor, and without the risk of breakage which attends the use of the chisel, while the work is smoothly wrought as it progresses, requiring only a slight polishing to finish it perfectly. Any number of arms and blades may be employed in the same head, limited only by the space on its periphery to attach them. Curved and serpentine mouldings` are as readily worked as straight ones, requiring only that the diameter of the circle described by the blades shall be adapted to the radius of the curve of the moulding. The construction is such that the head may be revolved in either direction and work .with the same efficiency as is shown by 'the diagram in red in iig. 2, where the red and black arms indicate the position of the arn when running in opposite directions. The yielding or elasticity of the blades, which is most conveniently obtained by forming' them` thin enough to spring slightly under the pressure applied, insures a steady and uniform feed to each,r andthe angle at which they are presented to the stone is such as to keep them self-sharpened, or nearly so, by the wear. The most effective position of the blades is one inclined slightly back of a radial line from theaxis of the head. The blades may be of any suitable length, and each end may be formed of a different pattern, so that, by reversing, a dierently formed moulding. will be wrought.

What I claim as my invention, isy 4 The employment of a series of spring blades or Scrapers h,in..combination with the clamping-arms C, and head or stock A, for acting successively on the material'to abrade it to the form of said blades, when constructed, arranged, and operatingsubstantially asand for the purpose set forth. i

I also claim the arm or holder C, when connectedy with the head A or its equivalent, by means of pivot d, i and the bearing bolts e e, arranged to allow .the blades to adjust themselves to the work when rotated in either direction, substantially as set forth.

I also claim, in combination with the blade h, and its set-bolt c, the chamfering away of theclamp sides at z', substantially in the manner and for the purpose set forth.,

In witness whereof I have hereunto signed my name in the presence' o f two subscribing witnesses.

' RALPH P. BAILEY.

Witnesses.:

JAY HYArr, i. ALBERT Haronr. 

